<template>
  <div id="home">
    <nav-bar class="home-nav">
      <div slot="center">购物街</div>
    </nav-bar>
    <tab-control
      :titles="['流行','新款','精选']"
      @tabClick="tabClick"
      ref="tabControl1"
      v-show="isTabFixed"
      class="tab-control"
    />
    <scroll
      class="content"
      ref="scroll"
      :probe-type="3"
      @scroll="contentScroll"
      :pull-up-load="true"
      @pullingUp="loadMore"
    >
      <home-swiper :banners="banners" @swiperImageLoad="swiperImageLoad" />
      <recommend-view :recommends="recommends" />
      <feature-view />
      <tab-control :titles="['流行','新款','精选']" @tabClick="tabClick" ref="tabControl2" />
      <goods-list :goods="goods[currentType].list" />
    </scroll>
    <!-- 原生组件监听 -->
    <back-top @click.native="backClick" v-show="isShowBackTop" />
  </div>
</template>
<script>
import NavBar from "components/common/navbar/NavBar";
import HomeSwiper from "./childComps/HomeSwiper";
import RecommendView from "./childComps/RecommendView";
import FeatureView from "./childComps/FeatureView";
import TabControl from "components/content/tabControl/TabControl";
import GoodsList from "components/content/goods/GoodsList";
import Scroll from "components/common/scroll/Scroll";
import BackTop from "components/content/backTop/BackTop";

import { getHomeMultidata, getHomeGoods } from "network/home";
import { debounce } from "common/utils";
export default {
  name: "Home",
  components: {
    NavBar,
    HomeSwiper,
    RecommendView,
    FeatureView,
    TabControl,
    GoodsList,
    Scroll,
    BackTop
  },
  data() {
    return {
      banners: [],
      recommends: [],
      goods: {
        pop: { page: 0, list: [] },
        new: { page: 0, list: [] },
        sell: { page: 0, list: [] }
      },
      currentType: "pop",
      isShowBackTop: false,
      tabOffsetTop: 0,
      isTabFixed: false,
      saveY: 0,
      itemImgListener:null
    };
  },
  created() {
    this.getHomeMultidata();
    this.getHomeGoods("pop");
    this.getHomeGoods("new");
    this.getHomeGoods("sell");
  },
  destroyed() {
    console.log("页面销毁");
  },
  activated() {
    //离开
    console.log("activated");
    this.$refs.scroll.scrollTo(0, this.saveY, 0);
    this.$refs.scroll.refresh();
  },
  deactivated() {
    //进来
    console.log("deactivated");
    this.saveY = this.$refs.scroll.getScrollY();
    this.$bus.$off("itemImageLoad", this.itemImgListener);
  },
  mounted() {
    //图片加载完成的事件监听
    const refresh = debounce(this.$refs.scroll.refresh,100);
    this.itemImgListener=() => {
      console.log("图片加载完成Home");
      refresh(); /*   this.$refs.scroll.refresh(); */
    };
    this.$bus.$on("itemImageLoad", this.itemImgListener);
    //获取他把control的offsetTop
    //所有的组件都有一个属性$el；用于获取组件中的元素
    //this.tabOffsetTop=this.$refs.tabControl.$el
  },
  methods: {
    backClick() {
      console.log("回到顶部");
      this.$refs.scroll.scrollTo(0, 0);
    },
    contentScroll(position) {
      //console.log(position);//位置
      //判断BackTop显示
      this.isShowBackTop = -position.y > 1000;
      //决定tabContorl是否吸顶 (postion:fixed)
      this.isTabFixed = -position.y > this.tabOffsetTop;
    },
    loadMore() {
      console.log("上拉加载更多");
      this.getHomeGoods(this.currentType);
    },
    tabClick(index) {
      console.log(index);
      switch (index) {
        case 0:
          this.currentType = "pop";
          break;
        case 1:
          this.currentType = "new";
          break;
        case 2:
          this.currentType = "sell";
          break;
      }
      this.$refs.tabControl1.currentIndex = index;
      this.$refs.tabControl2.currentIndex = index;
    },
    getHomeMultidata() {
      getHomeMultidata().then(res => {
        console.log(res);
        this.banners = res.data.banner.list;
        this.recommends = res.data.recommend.list;
      });
    },
    getHomeGoods(type) {
      const page = this.goods[type].page + 1;
      getHomeGoods(type, page).then(res => {
        console.log(res);
        this.goods[type].list.push(...res.data.list);
        this.goods[type].page += 1;

        this.$refs.scroll.finishPullUp();
      });
    },
    swiperImageLoad() {
      console.log(this.$refs.tabControl2.$el.offsetTop);
      this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop;
    }
  }
};
</script>
<style scoped>
#home {
  /*padding-top: 44px;*/
  height: 100vh;
  position: relative;
}
.home-nav {
  background-color: var(--color-tint);
  color: #fff;
}
.content {
  /* 设置scoll高度  height：300px  才可以滚动 */
  overflow: hidden;

  position: absolute;
  top: 44px;
  bottom: 49px;
  left: 0;
  right: 0;
}

.tab-control {
  position: relative;
  z-index: 9;
}
</style>
